package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str = "好好学习Java";


        StringBuilder builder = new StringBuilder(str);
        //StringBuffer  builder = new StringBuffer(str);
        builder.append(",为了找个好工作");
        System.out.println(builder);

        builder.replace(9,16,"就是为了使自己拥有一种足以改变世界的能力，拥有自己想要的一切。");
        System.out.println(builder);

        builder.delete(0,9);
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);



























        /*
        StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 = new StringBuilder("abc");
        String str = "abc";
        StringBuilder builder3 = new StringBuilder(str);
        String str2 = builder3.toString();

         */

    }
}
